/Engine/Source/Runtime/CoreUObject/Public/UObject/PackageResourceManager.h
OpenReadPackage that takes a PackageSegment
[FOpenPackageResult](API\Runtime\CoreUObject\UObject\FOpenPackageResult) OpenReadPackage ( const [FPackagePath](API\Runtime\CoreUObject\Misc\FPackagePath) & PackagePath, EPackageSegment PackageSegment, [FPackagePath](API\Runtime\CoreUObject\Misc\FPackagePath) * OutUpdatedPath )